The way the marker is set affects its binding to the terrain.
This affects the behavior of the AI ​​at the marker installation point.

Two ways to install the marker:

• in 3D terrain model

• on the map of the area

When objects on the ground above the level of the base of the terrain. I tried different terrain options. When a marker is created in the form of a terrain map, it attaches it to the surface of the object. AI moves to the point of the marker quickly and does not confuse the direction to the place of the marker.
If the marker is set from the 3D view, the marker is set with the correction for the height of the object surface level. AI cannot find the path to the marker at this point.
I have tried this only with move markers.
But you need to check other markers, I think there is a problem.
https://youtu.be/uW866Fpfag8